Answer: [tex]\dfrac{1}{3}[/tex]
Step-by-step explanation:
Given : The total number of hours Susan work in a week = 45 hours
The total number of hours she need to spend working with customers = 15 hours
Now, the fraction of Susan's time is spent working with customers is given by :-
[tex]\dfrac{\text{Hours spent with customers}}{\text{Total hours of working}}\\\\\dfrac{15}{45}=\dfrac{1}{3}[/tex]
Hence, the fraction of Susan's time is spent working with customers = [tex]\dfrac{1}{3}[/tex]